a3131

PFC
· Fully reconfigurable digitally-controlled power factor controller in CMOS technology
· On-chip AC-phase-locked sinusoidal 45...65Hz oscillator to improve AC-line noise rejection
· High accuracy through on-chip 10bit ADC and dedicated RISC processor
· Achievable high efficiency (>95%) and power factor (>0.99)
· Broad range of user-selectable PWM frequency (5kHz...200kHz)
· Low EMC filter requirements due to use of spread-spectrum PWM
· Two-wire interface to load software
· Supports 90V...135V and 195V...275V 60/50Hz mains standards
· On-chip PLL with 1% RC reference oscillator to generate 64MHz clock signal
Switching-Mode Power Supply Controller
· Current-mode switching power supply controller in CMOS technology
· Immediate response to low-frequency AC line swings
· Output voltage and current levels determined by external components only
· Energy-saving cycle-skipping mode for operation with low levels of output power
· On-chip overcurrent and short-circuit protection
· On-chip reference voltage source

The a3131 is a universal DSP-based PFC solution with Switching-mode Power Supply to be used in applications requiring power factor values close to unity and highly efficient DC power supply. Typical application areas for the a3131 are high-power DC motor controllers and lighting systems. The power factor controller (PFC) is based on the boost topology and is fully software-controlled. The PFC algorithm is loaded from an on-chip non-volatile memory for stand-alone operation or can be uploaded to the DSP core using a two-wire interface.

The switching-mode power supply controller (SMPSC) a3131 is based on the flyback topology with current feedback, and its role is to provide supply voltage(s) for any low-voltage electronics. Due to its immediate response, the current feedback topology makes the a3131 especially attractive for systems in which relatively high swings of the AC line voltage are expected.